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Can a JPEG compressed image be rotated without a loss in quality?

Asked 2009-02-12T21:35:09.850
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JPEG is a lossy compression scheme, so decompression-manipulation-recompression normally reduces the image quality further for each step. Is it possible to rotate a JPEG image without incurring further loss? From what little I know of the JPEG algorithm, it naively seems possible to avoid further loss with a bit of effort. Which common image manipulation programs (e.g. GIMP, Paint Shop Pro, Windows Photo Gallery) and graphic libraries cause quality loss when performing a rotation and which don't?

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If you are talking of rotating a JPEG image then there is no further compression right? It is about rotating pixel locations.

Doing rotation with any program will potentially change intermediate dimensions, as it needs to preserver original image, this may be an issue to consider.

answered 2009-02-12T21:43:48.440

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